Importance and purpose of Earthing
Q. Explain importance and purpose of earthing.
- To save human life from shock due to current leakage of installation.
- To protect large buildings from lightening fall.
- To isolate the faulty section. This is achieved by providing path of leakage current through earthing system at this instant protective gearing operates.
- To protect installed machines fed from O.H. line from lightening arresters.
- To maintain the line voltage constant (as neutral of every alternator, transformer is earthed)
- To maintain the potential of any part of a system at a definite value with respect to earth